lobject.c
上传用户:dzyhzl
上传日期:2019-04-29
资源大小:56270k
文件大小:3k
- /*
- ** $Id: lobject.c,v 1.55 2000/10/20 16:36:32 roberto Exp $
- ** Some generic functions over Lua objects
- ** See Copyright Notice in lua.h
- */
- #include <ctype.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "lua.h"
- #include "lmem.h"
- #include "lobject.h"
- #include "lstate.h"
- const TObject luaO_nilobject = {LUA_TNIL, {NULL}};
- const char *const luaO_typenames[] = {
- "userdata", "nil", "number", "string", "table", "function"
- };
- /*
- ** returns smaller power of 2 larger than `n' (minimum is MINPOWER2)
- */
- lint32 luaO_power2 (lint32 n) {
- lint32 p = MINPOWER2;
- while (p<=n) p<<=1;
- return p;
- }
- int luaO_equalObj (const TObject *t1, const TObject *t2) {
- if (ttype(t1) != ttype(t2)) return 0;
- switch (ttype(t1)) {
- case LUA_TNUMBER:
- return nvalue(t1) == nvalue(t2);
- case LUA_TSTRING: case LUA_TUSERDATA:
- return tsvalue(t1) == tsvalue(t2);
- case LUA_TTABLE:
- return hvalue(t1) == hvalue(t2);
- case LUA_TFUNCTION:
- return clvalue(t1) == clvalue(t2);
- default:
- LUA_ASSERT(ttype(t1) == LUA_TNIL, "invalid type");
- return 1; /* LUA_TNIL */
- }
- }
- char *luaO_openspace (lua_State *L, size_t n) {
- if (n > L->Mbuffsize) {
- luaM_reallocvector(L, L->Mbuffer, n, char);
- L->nblocks += (n - L->Mbuffsize)*sizeof(char);
- L->Mbuffsize = n;
- }
- return L->Mbuffer;
- }
- int luaO_str2d (const char *s, Number *result) { /* LUA_NUMBER */
- char *endptr;
- Number res = lua_str2number(s, &endptr);
- if (endptr == s) return 0; /* no conversion */
- while (isspace((unsigned char)*endptr)) endptr++;
- if (*endptr != ' ') return 0; /* invalid trailing characters? */
- *result = res;
- return 1;
- }
- /* maximum length of a string format for `luaO_verror' */
- #define MAX_VERROR 280
- /* this function needs to handle only '%d' and '%.XXs' formats */
- void luaO_verror (lua_State *L, const char *fmt, ...) {
- va_list argp;
- char buff[MAX_VERROR]; /* to hold formatted message */
- va_start(argp, fmt);
- vsprintf(buff, fmt, argp);
- va_end(argp);
- lua_error(L, buff);
- }
- void luaO_chunkid (char *out, const char *source, int bufflen) {
- if (*source == '=') {
- strncpy(out, source+1, bufflen); /* remove first char */
- out[bufflen-1] = ' '; /* ensures null termination */
- }
- else {
- if (*source == '@') {
- int l;
- source++; /* skip the `@' */
- bufflen -= sizeof("file `...%s'");
- l = strlen(source);
- if (l>bufflen) {
- source += (l-bufflen); /* get last part of file name */
- sprintf(out, "file `...%.99s'", source);
- }
- else
- sprintf(out, "file `%.99s'", source);
- }
- else {
- int len = strcspn(source, "n"); /* stop at first newline */
- bufflen -= sizeof("string "%.*s..."");
- if (len > bufflen) len = bufflen;
- if (source[len] != ' ') { /* must truncate? */
- strcpy(out, "string "");
- out += strlen(out);
- strncpy(out, source, len);
- strcpy(out+len, "..."");
- }
- else
- sprintf(out, "string "%.99s"", source);
- }
- }
- }